JPH03137846A - Program changing mechanism - Google Patents

Abstract

PURPOSE:To simplify the mechanism and to reduce the size by providing an idler plate with a guide member which prevents a pinch roller from being pressed against a capstan shaft according to the rotating direction of the idler plate. CONSTITUTION:When the program changing mechanism is in an FWD play state, one pinch roller 10 is pressed against a capstan shaft 17 across a tape and the other pinch roller 10' is separated from a capstan shaft 17'. For program switching from FWD play to REV play, a mode plate 5 is moved as shown by an arrow C and a head plate 2 is moved back as shown by an arrow B. Then when the plate 2 is moved forward to a play position by the movement of the plate 5 as shown by an arrow A, the REV-side roller 10' is pressed against the capstan shaft 17', but the FWD-side roller 10 is not pressed against the capstan shaft 17 since the claw piece 16' of a frame body 11' is impeded by the cam edge side of the idler plate 23'. In this state, the REV play mode is entered.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a program change mechanism for switching the tape running direction of a tape player.

[Summary of the Invention] The present invention provides a program change mechanism in which one of a pair of pinch rollers is selectively brought into pressure contact with a capstan shaft depending on the tape running direction. This is a design that has been significantly simplified and downsized.

[Prior Art] The inventors of the present application previously proposed a novel program change mechanism in Japanese Patent Application No. 309373/1983.

The program change mechanism according to the above-mentioned prior application includes: a drive gear that rotates forward and backward by motor drive; an intermediate gear that transmits the rotation of the drive gear; and a moving means that moves the intermediate gear according to the rotational direction of the drive gear. It is equipped with an intermittent gear that engages with the intermediate gear by the movement of the intermediate gear, a change plate that moves by the rotation of the first intermittent gear, and a means for regulating the movement of the moving means according to the movement position of the head plate, and does not require program switching. Normally,
The toothless notch of the intermittent gear is located opposite the intermediate gear, and the rotation of the driving gear is not transmitted to the intermittent gear.
When the drive side gear is reversed when switching programs, the intermediate gear is moved in that direction and meshed with the intermittent gear, so the intermittent gear rotates and the change plate linked to it moves and is connected to the pinch roller. control is now in place.

[Problems to be Solved by the Invention] The program change mechanism with the above configuration has an advantage over conventional mechanisms in that it does not use a plunger to unlock the intermittent gear. This invention requires a large number of parts, and cannot be said to have sufficiently simplified and downsized the mechanism. At the same time, it is an object of the present invention to further reduce the number of parts so as to sufficiently simplify and downsize the mechanism.

[Means for Solving the Problems] The present invention brings the pinch roller into pressure contact with the capstan shaft by advancing the head plate, and selectively connects one of the two pinch rollers to the capstan shaft according to the tape running direction. A tape player that is in pressure contact with a stun shaft includes a rotating body that rotates in forward and reverse directions, and an idler plate that rotates in accordance with the rotating direction of the rotating body, and the idler plate has the pinch function that rotates depending on the rotating direction of the idler plate. The above-mentioned problems are solved by a configuration in which a guide portion that prevents the roller from being pressed against the capstan shaft is provided.

[Operation] In the program change mechanism with the above configuration, when the head plate is moved backward, the rotating body is rotated to rotate the idler plate, and then the head plate is moved forward again, one of the pinch rollers moves from the capstan. However, the other pinch roller is blocked by the guide portion and is not pressed against the capstan shaft.

[Embodiment] FIGS. 1 to 8 show an embodiment of the present invention.

In the figure, 1 is a chassis, and a head plate 2 is disposed on the front side of the chassis so as to be movable in the direction of arrow AB. 3 is a head provided on the head plate, and 4 is a biasing spring for moving the head plate forward in the direction of arrow A.

On the back side of the chassis 1, a mode plate 5 for moving the head plate 2 is disposed so as to be movable in the direction of arrow C←→D. Reference numeral 6 designates its drive motor, and 7 designates a gear reduction portion, the final gear 7a of which is meshed with the rack tooth portion 5a of the mode plate 5. The mode plate 5 includes the head plate 2 in FWD, FF,
Cam edge 5 for moving to each mode position such as REV
b is formed. On the other hand, a shaft 8 is provided at one end of the head plate 2 and protrudes to the back side through a guide hole 1a formed in the chassis 1, and a roller 9 is attached to the tip of the shaft 8.
By engaging the cam edge 5b of the mode plate 5 with this roller 9, the head plate 2 is moved in the direction of the arrow AB.

The head plate 2 includes frames 11 and 11' that support pinch rollers 10 and 10' on both sides of the head 3.
are respectively rotatably provided around support shafts 12 and 12' erected on the chassis side. 13.13
' is a spring for pressing the pinch roller, and 14 and 14' are protrusions provided on the head plate side to receive the reaction force of the spring. Further, the head plate 2 is provided with an opening 15.15' for the purpose described below near the pinch roller support frames 11, 11', and the frame 11. Claw pieces 16, 16' provided at 11' are inserted.

17.17' is a capstan shaft, 18.18' is a flywheel which is a coaxial rotating body, and 19.19' is a coaxial gear.This flywheel and gear are located on the back side of the chassis.

2o is a belt hung around the flywheel 18, 18', 21 is a drive motor, and 22 is a pulley.

Each flywheel 18.18' is provided with an idler plate 23.23'' coaxially therewith, and each idler plate 23.23' has an idler gear 24.24' at its end connected by a shaft 25.25'. supported,
It is meshed with gears 19 and 19' coaxial with the flywheel. The idler gear 24, 24' is also slidable in the axial direction, and its boss end surface is connected to the spring 2.
6, it is in resilient frictional contact with the idler plate 23, 23'.

The idler plate 23, 23' has the chassis 1
Pinch roller support frames 11, 11 protruding from the back side of
A cam edge R is formed to serve as a guide for the 'side claw pieces 16, 16'.

On the back side of the chassis 1, there is an idler plate 23.2.
3' in the operation described below, the capstan shaft 17.
a concave portion 27.27 for regulating the rotation angle range of the idler plate by engagement with the tip of the idler gear shaft 25.25' when the idler plate rotates about the idler gear shaft 25.25';
' is provided.

Also, on the back side of the chassis 1, there is an idler gear 24.2.
A reel gear 28.degree. 28' is provided at a portion facing 4'.

Next, the operation of the program change mechanism configured as described above and the operation of each part related thereto will be explained.

Figure 1 shows that the program change mechanism is FWD play (B
This indicates the state in which the F
WI), one pinch roller 10 is capstan@
17 with tape and crimp it, and idler gear 24 is F.
It is meshed with the WD reel gear 28. In the other pinch roller 10', the cam edge R of the idler plate 23 is engaged with the claw piece 16 on the support frame 11 side, and the pinch roller 10' is separated from the capstan shaft 17' and the idler gear 241 is separated from the reel gear 28'. The head plate 2 is placed in the forward position.

20 In FWD play, the motor 21 is driven in the direction of arrow P (normal rotation).

To switch the program from FWD play to REV play (rewind), the mode plate 5 is moved in the direction of arrow C by the drive of the motor 6, and the cam edge 5b
By engaging with the roller 9 on the head plate 2 side, the head plate 2 is moved backward in the direction of arrow B.

FIG. 2 shows the retracted position of the head plate 2. When the head plate 2 is retracted, the opening 15 on the head plate side engages with the claw piece 16 on the pinch roller support frame 11 side, and the pinch roller support frame 11 retreats, and the pinch roller 10 is separated from the capstan shaft 17. In this case, FWD, REV
When both the pin rollers 10 and 10' retreat to the FF (fast forward) position, the power supply to the motor 6 is cut off by a detection signal from a means (not shown) for detecting this, and the movement of the head plate is stopped. .

When the motor 21 is driven in the reverse direction opposite to the arrow P in the above position, as shown in FIG.
' both rotate in one direction of arrow Q.

That is, if we look at the idler plate 23.

As the flywheel 18 rotates, the gear 19 becomes integrated with it.
The idler gear 24 that meshes with the idler gear 24 rotates clockwise (Fig. 3), but at this time, a contact friction force is generated between the boss end face of the idler gear 24 and the idler plate 23, and due to the friction force, the idler plate 23 moves with the idler gear 24. The capstan shaft 17 is rotated in the direction of arrow Q around the capstan shaft 17.

The rotation angle is regulated by the engagement between the tip of the idler gear shaft 27 and the concave portion 27 on the chassis side. This operation is similarly performed on the other idler plate 23'.

Then, due to the rotation of the idler plates 23 and 23', the idler gear 24, which has moved with the idler plate 23 on the FWD side, is separated from the reel gear 28, and the idler gear 24, which has moved with the idler plate 23' on the REV side, moves in the opposite direction. 24' meshes with reel gear 28'.

The states shown in Figures 2 and 3 are FF (fast forward),
It is also the REW (rewind) position.

Next, in the state shown in FIG. 3, by moving the mode plate 5, the head plate 2 is advanced toward the arrow A to the play position, as shown in FIG. 4.

The pinch roller 10' on the REV side is the capstan shaft 17
However, as shown in FIG. 7, the pinch roller 10 on the FWD side is in pressure contact with the cam edge R of the idler plate 23' because the claw piece 16' of the frame 11 is obstructed by the cam edge R of the idler plate 23'.
It does not come into pressure contact with the capstan shaft 17. In this state, REV
It becomes a play.

FIGS. 9 and 10 show an example in which a single coil spring 29 is used as the pressure spring for the pinch roller, which is spread between the pinch roller support frames 11 and 11'.

In the above embodiment, the idler plate 1- is rotated by the contact friction force with the idler gear, but for example, a contact part is formed between the idler plate and the flywheel, and the idler plate 1- is rotated by the contact friction. It is also possible to rotate.

Further, the pinch roller shaft may be provided on either the chassis side or the head plate side.

[Effects of the Invention] As described above, according to the present invention, it is possible to significantly reduce the number of parts, thereby providing a program change mechanism that can be downsized, improved in reliability, and reduced in cost. .

[Brief explanation of the drawing]

1 to 4 are plan views showing switching operations of a program change mechanism according to an embodiment of the present invention; FIG. 5 is a plan view of a head plate supporting a pinch roller; and FIG.
The figure is a vertical cross-sectional view of the engaging portion between the pinch roller and the idler plate, FIG. 7 is a plan view, FIG. 8 is an enlarged vertical cross-sectional view of the connecting portion between the flywheel and the idler gear,
FIG. 0 is a plan view showing a switching operation of a program change mechanism according to another embodiment. 1...Chassis, 2...Head plate, 3...Head, 4...
...Spring, 6...Motor, 7.
......Gear reduction section, 5...Mode plate, 9...Roller, 10.1
0' ・・・・・・Pinch roller, 11.11'
......Support frame, 12°12'...
......Spindle, 13.13'... Spring for pressure welding, 15.15"... Opening, 16°16'... ...Claw piece, 17.17'
・・・・・・・・・Capstan shaft, 18.18'
...Flywheel, 19.19'...
......Gear, 20...Belt,
21...Motor, 22...
・Pulley, 23°23'...Idler plate, 24.24'...Idler gear, R...Cam edge, 25°25 '...
・・・・・・Idler gear shaft, 26・・・・・・・・・
・Spring, 27.27'...Concave part, 28.28'...Reel gear, 29...
·······coil spring.

Claims (1)

[Claims] As the head plate advances, the pinch roller is brought into pressure contact with the capstan shaft, and one of the two pinch rollers is selectively brought into contact with the capstan shaft depending on the tape running direction. The tape player is equipped with a rotating body that rotates in forward and reverse directions, and an idler plate that rotates in accordance with the rotating direction of the rotating body, and the idler plate is configured to rotate the pinch roller to the capstan shaft according to the rotating direction of the idler plate. A program change mechanism characterized by a guide section that prevents pressure welding.